One would assume that good hygiene is a given, but some people will surprise you with their pungent lack of self-awareness.
I'm big on reciprocity. Give as much (or more) as you receive. I'm very tactile and love cuddling, caressing, et cetera. But when I begin to notice that my cuddle buddy isn't putting in as much effort--just lying there, sometimes even telling me what to do--it rubs me the wrong way. I'm a great cuddler, but I'm not a pro. I won't put up with one-sided cuddling.